Import the "gerbert" kernel I worked on earlier this year.

It's a lot crappier than I remembered it. It's gonna need a lot of work.

Kernel/Boot/boot.asm

@@ -0,0 +1,106 @@
+; asmsyntax=nasm
+
+[org 0x7c00]
+[bits 16]
+
+boot:
+    push cs
+    pop ds
+    xor bx, bx
+    mov ah, 0x0e
+    mov si, message
+    lodsb
+.lewp:
+    int 0x10
+    lodsb
+    cmp al, 0
+    jne .lewp
+
+    mov bx, 0x1000
+    mov es, bx
+    xor bx, bx              ; Load kernel @ 0x10000
+
+    mov ah, 0x02            ; cmd 0x02 - Read Disk Sectors
+    mov al, 72              ; 72 sectors (max allowed by bochs BIOS)
+    mov ch, 0               ; track 0
+    mov cl, 10              ; sector 10
+    mov dh, 0               ; head 0
+    mov dl, 0               ; drive 0 (fd0)
+    int 0x13
+
+    jc fug
+
+    mov ah, 0x02
+    mov al, 32
+    add bx, 0x9000
+    mov ch, 2
+    mov cl, 10
+    mov dh, 0
+    mov dl, 0
+    int 0x13
+
+    jc fug
+
+    lgdt [cs:test_gdt_ptr]
+
+    mov eax, cr0
+    or al, 1
+    mov cr0, eax
+
+    jmp 0x08:pmode
+
+pmode:
+[bits 32]
+    mov ax, 0x10
+    mov ds, ax
+    mov es, ax
+    mov fs, ax
+    mov gs, ax
+
+    mov ss, ax
+    mov esp, 0x2000
+
+    jmp 0x10000
+
+    hlt
+
+test_gdt_ptr:
+    dw (test_gdt_end-test_gdt)
+    dd test_gdt
+
+test_gdt:
+    dd 0
+    dd 0
+    dd 0x0000ffff
+    dd 0x00cf9a00
+    dd 0x0000ffff
+    dd 0x00cf9200
+    dd 0
+    dd 0
+    dd 0
+    dd 0
+test_gdt_end:
+
+[bits 16]
+fug:
+    xor bx, bx
+    mov ah, 0x0e
+    mov si, fug_message
+    lodsb
+.lewp:
+    int 0x10
+    lodsb
+    cmp al, 0
+    jne .lewp
+
+    cli
+    hlt
+    
+message:
+    db "boot!", 0x0d, 0x0a, 0
+
+fug_message:
+    db "FUG!", 0x0d, 0x0a, 0
+
+times 510-($-$$) db 0
+dw 0xaa55